Step 1

Find the file commonHTML5Types.xsd located in the Visual Studio install directory and back it up (just in case). Mine is here: C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\Packages\schemas\html

Step 2

Step 3

Restart Visual Studio and that's it. You now have all the ng-* attributes available in Intellisense. This Works On My Machinetm, so please let me know if it works on yours too.
I still want to add native support in either Visual Studio or Web
Essentials, so if this is something you’re interested in, please vote for it here.

OPTION 2

You can install directly into ReSharper 8.0 via the Extension Manager
in the ReSharper menu. Since the package is currently pre-release for
8.0 (nightly builds might introduce breaking changes), make sure
"Include prerelease" is selected in the dialog.
To install in ReSharper 7.1: